body {
  background: darkgray;
}
.ul1 li a:focus {
  background: #E7E7E7;
}
.jumbotron {
  background: url(../images/img/bg.jpg) no-repeat;
  background-size: 100% 100%;
  height: 192px;
  margin-top: 50px;
}
.jumbotron .zi p {
  color: lightgray;
}
